The castle is operated by the Office of Public Works, and is open to the public seasonally with guided tours.
Ross Castle was built in the late 15th century by local ruling clan the O'Donoghues Mor (Ross), though ownership changed hands during the Second Desmond Rebellion of the 1580s to the MacCarthy Mór. He then leased the castle and the lands to Sir Valentine Browne, ancestor of the Earls of Kenmare. The castle was amongst the last to surrender to Oliver Cromwell's Roundheads during the Irish Confederate Wars, and was only taken when artillery was brought by boat via the River Laune. Lord Muskerry (MacCarty) held the castle against Edmund Ludlow who marched to Ross with 4,000 foot soldiers and 200 horse; however, it was by water that he attacked the stronghold. The Irish had a prophecy that Ross could never be taken until a warship could swim on the lake, an unbelievable prospect.
Ross may all assault disdain Till on Lough Lein strange ship shall sail.
The ships were built in Kinsale, brought by water to Killorglin and then dragged by oxen to Ross Castle. The sight of the ships unnerved the onlookers and the castle soon submitted.
At the end of the wars, the Brownes were able to show that their heir was too young to have taken part in the rebellion and they retained the lands. By about 1688, they had erected a mansion house near the castle, but their adherence to James II of England caused them to be exiled. The castle became a military barracks, which remained so until early in the 19th century. The Brownes did not return to live at Ross but built Kenmare House near Killarney.
There is a legend that O'Donoghue leaped or was sucked out of the window of the grand chamber at the top of the castle and disappeared into the waters of the lake along with his horse, his table and his library. It is said that O'Donoghue now lives in a great palace at the bottom of the lake where he keeps a close eye on everything that he sees.
Governors of the garrison at Ross Castle included:
The castle is typical of strongholds of Irish chieftains built during the Middle Ages. The tower house had square bartizans on diagonally opposite corners and a thick end wall. The tower was originally surrounded by a square bawn defended by round corner towers on each end.
The structure is stacked and mortared stone with thick walls and providing five inner stories plus the roof.
The front entrance was a small anteroom secured by an iron grill or 'yett' at the outer wall. The yett could be closed from inside via a chain that could then be secured even if the front door was closed. This room provided small side access holes and a "murder-hole" above which allowed the defenders to attack anybody in the room.
The front door, on the inside of the anteroom, was constructed of two layers of thick Irish oak, one layer 90 degrees to the other with the boards riveted together. If the door was a single layer with the wood fibres going in a single direction, it would have been possible to split the door. The second cross layer prevented that. The door opened inward and was backed by two heavy beams fitted into the stone structure.
Windows at the lower levels were vertical thin slits preventing entrance into the structure but allowing persons inside to aim and fire arrows or guns at attackers. The windows on the top levels were larger to allow in light. It was felt that attackers would not be able to scale to those heights so larger windows were safe.
The spiral staircase, located in the front left corner, was built in a clockwise direction. Attackers, ascending up would have their sword in their right hand and would be impeded by the center structure of the staircase. Defenders, facing down, would have their swords swinging at the outer part of the staircase giving them an advantage.
In addition, the stairs were of uneven height to throw off an attacker's charge by interfering with his gait.
Machicolations were stone structures at the top of the castle protruding out from the wall with a hole in the floor. There are two on Ross Castle, one over the front door and another on the back wall. The one at the front would allow defenders to drop stones or boiling oil on attackers at the front door, the only entrance to the castle.
The parapet at roof level is 'crenellated' providing ups, 'merlons' and downs, 'crenels', to allow defenders to hide behind the merlons while firing arrows or guns through the crenels.
The first floor was used for storage.
The second floor was a living space for the house attendants and guards. Straw was spread on the floor to sleep on. There was typically no furniture.
The third floor was for food preparation and living and eating space for the house attendants and guards.
The fourth floor was the sleeping and living space for the chieftain and his family. The fourth floor had an arched stone roof supporting a stone floor of the fifth story as compared to the wood beam floors of the lower stories.
The fifth floor was the great room where the chieftain ate and entertained. This room was also the last sanctuary as it had a stone floor as a fire break from fire in the lower floors.
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